Propeller



J. C. RYAN.

PROPELLER.

APPLICATION FILED JAN.19, 1911.

1 07,834. Patented June 24, I919.

UNITED STATES PATENT OFFICE.

JOHN "0. RYAN, or TORONTO, ONTARIO, CANADA.

PROPIELLER.

To all whom it may concern:

Be it known that 1, JOHN CARL RYAN, a subyect of the King of Great Britain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Propellers, described in the following specification and illustrated in the acco-n'ipanying drawings,

that form part of the same.

The principal object of the invention is to increase the gripping area of the propeller and thus effect a greater propelling eiliciency thereby obtaining more effective results from the power plant. 7

The principal feature of the invention consists in the novel construction and arrangement of a plurality of spiral vanes upon the shaft whereby the water is forced from one blade to the other in successive propelling contact.

In the drawings Figure 1 is a longitudinal elevational view of my improved propeller.

F 2 is a longitudinal elevational view taken at right anglesto the view shown in Fig. 1.

Fig. 3 is a rear end elevational view.

The propeller is formed of a tubular shaft 1 which is adapted to be placed upon and secured to the propeller shaft of the vessel.

Secured to the shaft 1 at one end are a pair of oppositely arranged spirally formed vanes or blades 2 which in elevation are substantially semi-circular, having the rounded forward ends 3 adapted to cut into the water.

4 are a pair of vanes, similarly formed to the vanes 2 but of larger dimensions having their forward ends 5 meeting the tail ends 6 of the vanes 52- at an intersecting angle close in to the shaft.

7 are another and similar pair of vanes arranged upon the shaft so that the forward ends 8 intersect the tail ends 9 of the vanes l.

The intersecting arrangement of the suc cessive pairs of vanes is a very important feature of the device as each vane presents an edge to the water in such a way as to cut through the water with practically no resistance to rotation and the successive vanes Specification of Letters Patent. Patented June 24, 1919.

Application filed January 19, 1917.

Serial No.'143,394.

being angularly set in relation to the preceding vanes receive the full impact of the water forced backwardly by the preceding vanes.

This peculiar action insures the maximum resistance to the screw and eliminates a spiral swirl which would occur with a continuous spiral or set of spiral vanes.

The intersecting arrangement of the vanes also insures the engagement of the dead water not engaged by the preceding vanes consequently the effect in rotation is that the first set of vanes sets up a flow of water in one direction and this flow is intercepted by the second set and along with a quantity of area of water not directly disturbed by the first set is forced in a direction at variance with the first flow.

This action is repeated by the succeeding set or sets of vanes and the succeeding sets are formed in increased diameters'to render the resistance increasingly effective as the water is given greater momentum.

lVith the use of a propeller such as de scribed a boat may be driven with much greater speed with a given power than'can be achieved with the present forms of propellers.

Vhat I claim as my invention is:

1. A propeller, comprising, a shaft, and a plurality of spirally formed vanes arranged in pairs, the plane surface of the forward ends of each successive pair being arranged to intersect the plane surface of the rearward ends of the preceding pair of vanes.

2. A propeller, comprising, a shaft, and a plurality of vanes of substantially semicircular form secured to said shaft in spiral arrangement, said vanes being arranged in opposing pairs and the successive pairs having their forward ends intersecting the tail ends of the preceding pair.

3. A propeller, comprising, a shaft, and a plurality of sets of spiral vanes secured to said shaft and arranged in successive intersecting sets, each successive set being of larger dimensions than the preceding set.

JOHN C. RYAN Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

